code: def _median_bias(n):
      ii_2 = 2 * np.arange(1.0, (n - 1) // 2 + 1)
      return 1 + np.sum(1.0 / (ii_2 + 1) - 1.0 / ii_2)
  
file_path: mne-python/mne/time_frequency/tests/test_psd.py
imports: import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_almost_equal, assert_array_equal
  from scipy.signal import welch
  from mne.time_frequency import psd_array_multitaper, psd_array_welch
  from mne.time_frequency.multitaper import _psd_from_mt
  from mne.time_frequency.psd import _median_biases
  from mne.utils import catch_logging
label_desc: Use image node_id 6 for calling a global function with example usage: _median_bias(n) and returns: unknown